1252220121 has 16 divisors (see below), whose sum is σ = 1875988800. Its totient is φ = 825431904.

The previous prime is 1252220111. The next prime is 1252220129. The reversal of 1252220121 is 1210222521.

1252220121 is a `hidden beast` number, since 1 + 2 + 522 + 20 + 121 = 666.

It is not a de Polignac number, because 1252220121 - 2⁵ = 1252220089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1252220094 and 1252220103.

It is not an unprimeable number, because it can be changed into a prime (1252220129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 258151 + ... + 262956.

It is an arithmetic number, because the mean of its divisors is an integer number (117249300).

Almost surely, 2^1252220121 is an apocalyptic number.

It is an amenable number.

1252220121 is a deficient number, since it is larger than the sum of its proper divisors (623768679).

1252220121 is an equidigital number, since it uses as much as digits as its factorization.

1252220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521205 (or 521199 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1252220121 is about 35386.7223828373. The cubic root of 1252220121 is about 1077.8547152475.

Adding to 1252220121 its reverse (1210222521), we get a palindrome (2462442642).

The spelling of 1252220121 in words is "one billion, two hundred fifty-two million, two hundred twenty thousand, one hundred twenty-one".